The DMK tested its downtrend (line a) in August and had a sharp, three-week pullback.
The DMK party has 18 members in the Lok Sabha, or the lower house of Parliament.
Congress, lacking a majority, relies on Mr Raja's party, the DMK, for parliamentary support.
The DMK had lost state elections in 2011 and is now in the opposition in Tamil Nadu.
Verghese, a political analyst, said DMK's decision was driven by regional political compulsions to outdo other parties.
In 1984, the decline accelerated, as it fell 25% to a low of 0.2881, or 3.47 DMK per USD.
One week later, the DMK also broke through its corresponding resistance, line d.
The DMK is the main opposition party in the southern state of Tamil Nadu, which has a large population of Tamils.
The DMK party's 18 MPs will not support the Congress party-led government.
Former telecommunications minister A Raja and Kanimozhi, a lawmaker from the DMK party, are among 14 people charged in connection with the case.
The regional DMK party, which withdrew its support last week, has 18 MPs and held five ministerial posts in the Congress party-led government.
The DMK pullout will now make the government more dependent on such outside parties, limiting its room to push through key policy decisions.
Mr. Nath, the parliamentary affairs minister, said the government is considering DMK's demands and will hold talks with the party to resolve the differences.
The issue of Sri Lankan Tamils was also raised in parliament by MPs from the DMK and AIADMK, another regional party from Tamil Nadu.
Nomura, in a research note, said the DMK decision has made the political situation in India less certain, which is bad for the reforms process.
The timing of the CBI's raid, coming soon after the DMK left the government, "only demonstrates that government is not dictating the CBI, " Mr. Nath said.
The weekly chart shows that the DMK was in a well-established downtrend (line a) starting in 1982, as it was falling in value against the US dollar.
In Tamil Nadu, a large southern state, Congress's local ally (and national coalition partner), the DMK, was routed as voters vented their anger over a telecom-licensing scandal.
As you can see on the above chart, the DMK futures gapped higher and accelerated to the upside, as there was concerted intervention to lower the dollar.
The coalition government still can muster a majority of votes in Parliament even after the DMK's exit, which means it will be unlikely to face a no-confidence vote.
The government is examining the demands of the DMK and expects the party would review its decision if Parliament agrees to adopt a resolution on the Lankan Tamil issue, he said.
Separately, A. Raja, party member and former telecom minister, told The Wall Street Journal that DMK ministers in the government will resign from their posts later this evening or Wednesday morning.
But neither of this state's most powerful politicians - the former film script writer Karunanidhi of the DMK, and the former actress Jayalalithaa of the AIADMK - is actually standing in this election.
Correspondents say there is no immediate threat to the government, but the DMK pullout will make it more difficult for it to pass legislation - the Congress party is dependent on several regional allies for support in parliament.
The government didn't have a majority in Parliament even before the DMK pullout and it has been surviving on support from parties which aren't part of the coalition but have been voting in its favor on key issues.
The government is dependent on the Trinamool Congress and the DMK for its Parliamentary majority but it does not face any immediate threat of losing power as both have assured the Congress party they would not leave the coalition.
So people in this state know that if either of their main regional parties sweeps this election - last time it was a DMK-led alliance, this time could be different - then it will be in pole position to help form the next Indian government in Delhi.
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