,Instrument,"U.S. government securities/Treasury constant maturities/Nominal"
  ,Maturity,"20-year"
  ,Frequency,"Annual"
  ,Description,"20-YEAR U.S. GOVERNMENT CONSTANT MATURITY YIELD"
  ,Status,"Discontinued"
  ,Note,"Yields on actively traded non-inflation-indexed issues adjusted to constant maturities. The 30-year Treasury constant maturity series was discontinued on February 18, 2002, and reintroduced on February 9, 2006. From February 18, 2002, to February 9, 2006, the U.S. Treasury published a factor for adjusting the daily nominal 20-year constant maturity in order to estimate a 30-year nominal rate. The historical adjustment factor can be found at www.treas.gov/offices/domestic-finance/debt-management/interest-rate/ltcompositeindex_historical.shtml. Source: U.S. Treasury."
  ,Note,"Series ended December 31, 1986."


DATE      , TCMNOMY20
1962, 3.99
1963, 4.05
1964, 4.19
1965, 4.27
1966, 4.77
1967, 5.01
1968, 5.45
1969, 6.32
1970, 6.87
1971, 6.12
1972, 6.01
1973, 7.12
1974, 8.06
1975, 8.20
1976, 7.86
1977, 7.67
1978, 8.48
1979, 9.32
1980, 11.36
1981, 13.72
1982, 12.92
1983, 11.34
1984, 12.49
1985, 10.97
1986, 7.84
1987, ND
1988, ND
1989, ND
1990, ND
1991, ND
1992, ND
1993, ND
1994, ND
1995, ND
1996, ND
1997, ND
1998, ND
1999, ND
2000, ND
2001, ND
2002, ND
2003, ND
2004, ND
2005, ND
2006, ND
2007, ND
2008, ND