Year	Percent
1950	1.27
1951	1.397
1952	1.617
1953	1.775
1954	1.888
1955	1.974
1956	2.041
1957	2.101
1958	2.165
1959	2.237
1960	2.315
1961	2.396
1962	2.47
1963	2.532
1964	2.586
1965	2.648
1966	2.733
1967	2.845
1968	2.985
1969	3.154
1970	3.329
1971	3.503
1972	3.73
1973	4.054
1974	4.446
1975	4.835
1976	5.154
1977	5.38
1978	5.516
1979	5.564
1980	5.573
1981	5.558
1982	5.448
1983	5.185
1984	4.806
1985	4.351
1986	3.897
1987	3.611
1988	3.61
1989	3.842
1990	4.201
1991	4.512
1992	4.5
1993	3.999
1994	3.092
1995	2.012
1996	1.021
1997	0.339
1998	0.114
1999	0.357
2000	0.876
2001	1.441
2002	1.933
2003	2.312
2004	2.574
2005	2.75
2006	2.929
2007	3.296
2008	3.972
2009	4.873
2010	5.796
2011	6.514
2012	6.835
2013	6.693
2014	6.18
2015	5.537
2016	4.943
2017	4.381
2018	3.795
2019	3.205
2020	2.613
2021	2.043
2022	1.581
2023	1.305
2024	1.204
2025	1.201
2026	1.209
2027	1.192
2028	1.136
2029	1.04
2030	0.93
2031	0.839
2032	0.773
2033	0.731
2034	0.71
2035	0.704
2036	0.701
2037	0.697
2038	0.688
2039	0.675
2040	0.66
2041	0.647
2042	0.638
2043	0.635
2044	0.636
2045	0.639
2046	0.641
2047	0.636
2048	0.622
2049	0.597
2050	0.566
2051	0.535
2052	0.503
2053	0.471
2054	0.439
2055	0.407
2056	0.375
2057	0.341
2058	0.308
2059	0.276
2060	0.244
2061	0.212
2062	0.181
2063	0.151
2064	0.123
2065	0.096
2066	0.07
2067	0.044
2068	0.02
2069	-0.003
2070	-0.025
2071	-0.047
2072	-0.068
2073	-0.088
2074	-0.108
2075	-0.127
2076	-0.145
2077	-0.163
2078	-0.181
2079	-0.199
2080	-0.216
2081	-0.232
2082	-0.248
2083	-0.263
2084	-0.278
2085	-0.292
2086	-0.305
2087	-0.317
2088	-0.327
2089	-0.336
2090	-0.344
2091	-0.351
2092	-0.357
2093	-0.363
2094	-0.368
2095	-0.373
2096	-0.377
2097	-0.381
2098	-0.383
2099	-0.384