Year,Conditional volatility
1922,2.4265
1923,2.1907
1924,2.5936
1925,2.8437
1926,2.4142
1927,2.1564
1928,2.8638
1929,2.9399
1930,6.1567
1931,9.0258
1932,8.8452
1933,7.4269
1934,6.3504
1935,5.6475
1936,4.7696
1937,4.2345
1938,3.6975
1939,3.7808
1940,3.7756
1941,4.6127
1942,5.4553
1943,5.552
1944,5.0386
1945,4.4912
1946,3.8348
1947,3.3003
1948,2.9906
1949,3.4948
1950,4.6226
1951,3.8956
1952,4.1616
1953,5.1515
1954,4.362
1955,3.691
1956,3.3376
1957,2.8274
1958,2.509
1959,2.252
1960,1.9138
1961,1.6358
1962,1.7201
1963,1.4702
1964,1.3631
1965,2.0875
1966,1.8389
1967,1.6861
1968,1.6399
1969,2.0029
1970,1.7053
1971,1.4604
1972,1.2884
1973,1.3949
1974,1.1989
1975,1.0345
1976,0.8968
1977,0.9659
1978,1.0034
1979,0.8931
1980,0.823
1981,0.7518
1982,0.6607
1983,0.6114
1984,0.5457
1985,0.532
1986,0.7931
1987,0.7169
1988,0.686
1989,0.6219
1990,0.5985
1991,0.6045
1992,0.5814
1993,0.5427
1994,0.6951
1995,0.8091
1996,0.8309
1997,0.7299
1998,0.6424
1999,0.5728
2000,0.5289
2001,0.6432
2002,0.5739
2003,0.5305
2004,0.5121
2005,0.7797
2006,0.685
2007,0.6935
2008,0.6145
2009,0.5511
2010,0.7571
2011,0.6651