What percentage of silver was in US coins?

The following denominations of circulating coins were made of 90% silver and 10% copper:

> Half dimes, up to 1873

> Dimes, quarters, and half dollars up to 1964

> Dollars up to 1935

These were 40% silver and 60% copper:

> Half dollars, 1965-1969.

These were 35% silver:

> Nickels, mid-1942 to 1945 due to wartime metal shortages. All other nickels are made of copper and nickel.

Collectors' versions of quarters, halves, and dollars were also made of 40% silver at various times from 1971 to 1976. Since 1992 special "prestige" versions of dimes, quarters, and halves have been made of 90% silver, and are only available to collectors.