Why the coins are released after one or two years by the Reserve Bank of India?

new coins,India,Release - RBI is ready to issue a new bimetallic 10 Rupee coin for circulation.
The look: The obverse side has the lion capitol with numeral 10 and year of manufacture. On reverse side, a double line cross with a dot in each pellet of cross and denomination written in Hindi and English around.

This design has been prepaed by National Institute of Design, Ahmedabad with the theme of Unity in Diversity. The outer side metal is Nickel-Bronze and the inner side metal is Ferrous Steel. The weight of the coin would be 8 grams and the diameter would be 28 mm.

The coins are being minted at mainly Noida and Mumbai mint. The coins worth Rs.70 million was already stored in its stock till August 2008.
@kumarpslv (3216)
India
June 3, 2009 10:18pm CST
I happened to see a new 10 Rupee coin and that has been coined in 2006.Am I too late to see this coin? But it seems all the coins are released by the Reserve Bank of India at lease a year after the manufacturing of the coins. Is there any specific reason for the delayed release?
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