They're printed every year.
According to the Bureau of Engraving and Printing, 45% of all U.S. currency printed are one-dollar bills.
about 500
The 1935 A subseries of $1 bills was the longest within the longest series of any US bill. They were printed during the first half of the 1940s.
Not at all. The Federal government first issued that denomination in the mid-19th century.
1976 was the first year that the modern looking $2 bill was printed. However, $2 bills have been printed in one form or another since the 1860s
They printed small size (aka modern size) bills for 1928, 1934, and 1934A. Large size $500 bills were printed for many different years between 1862 and 1922.
The first $20 FRN was printed in 1914. Unlike modern Federal Reserve Notes the bills had red seals; seal colors weren't standardized until 1928.
The first federally-issued $5 bills were printed in 1861 as "demand notes" to help finance the Civil War. The first $5 bills printed as regular-series currency appeared a year later. They were issued as United States Notes, a form of currency that was issued up till the end of the 1960s.
The $2 bill has not been discontinued. New ones are printed as needed. The most recent series is dated 2008.
The first federally-issued $5 bills were "Demand Notes" printed in 1861. They were only issued for one year. In 1862, the first standard-series United States Notes were printed to help pay for the Civil War.
No. US bills are printed by "series" date regardless of the year when they're actually produced. As of 2015 the most recent series of $2 bills is dated 2013, although they were printed in 2014.