None, Roosevelt dimes replaced the Mercury dimes in1946
The date.
It appears as though there were 620,684 silver Roosevelt Dimes minted in 2008. All of these silver dimes are proof and available only in the 2008 Silver Proof set.
Dimes minted in 1965 and later weigh 1/8 of an ounce, so get out your calculator and go with it.
The 1944 Mercury Dimes (aka - Winged Liberty Head) were minted in Phillie, Denver, and San Francisco.
Total production of 2010 U.S. dimes was 1,120,689,364 this includes clad & silver proof coins.
Silver dimes were last minted in 1964 in the US.
The first US dimes were minted in 1796.
In 1990, the Philadelphia mint struck 1,034,340,000 dimes, the Denver mint struck 839,995,824 dimes and the San Francisco mint struck 3,299,559 proof dimes for a total of 1,877,635,463.
Yes, all mercury dimes were minted before the mint started making copper/nickel dimes.
Mintage of 1902 Barber dimes: Proof 777/ Philadelphia 21,380,000/ New Orleans 4,500,000/ San Francisco 2,070,000
US dimes were first minted in Philadephia in 1796.