Year	Percent
1950	2.936
1951	3.129
1952	3.437
1953	3.604
1954	3.663
1955	3.642
1956	3.569
1957	3.464
1958	3.343
1959	3.214
1960	3.078
1961	2.926
1962	2.749
1963	2.537
1964	2.299
1965	2.049
1966	1.808
1967	1.601
1968	1.449
1969	1.351
1970	1.273
1971	1.192
1972	1.124
1973	1.089
1974	1.079
1975	1.089
1976	1.1
1977	1.051
1978	0.899
1979	0.647
1980	0.352
1981	0.07
1982	-0.178
1983	-0.387
1984	-0.549
1985	-0.699
1986	-0.846
1987	-0.906
1988	-0.788
1989	-0.497
1990	-0.092
1991	0.324
1992	0.614
1993	0.678
1994	0.515
1995	0.231
1996	-0.051
1997	-0.257
1998	-0.345
1999	-0.308
2000	-0.2
2001	-0.094
2002	-0.027
2003	-0.015
2004	-0.061
2005	-0.137
2006	-0.205
2007	-0.22
2008	-0.146
2009	0.016
2010	0.228
2011	0.436
2012	0.596
2013	0.679
2014	0.683
2015	0.645
2016	0.604
2017	0.574
2018	0.553
2019	0.544
2020	0.538
2021	0.526
2022	0.507
2023	0.484
2024	0.457
2025	0.429
2026	0.399
2027	0.368
2028	0.339
2029	0.31
2030	0.281
2031	0.253
2032	0.223
2033	0.191
2034	0.156
2035	0.121
2036	0.086
2037	0.053
2038	0.022
2039	-0.007
2040	-0.033
2041	-0.06
2042	-0.085
2043	-0.112
2044	-0.138
2045	-0.163
2046	-0.189
2047	-0.211
2048	-0.232
2049	-0.252
2050	-0.269
2051	-0.286
2052	-0.303
2053	-0.32
2054	-0.338
2055	-0.357
2056	-0.375
2057	-0.393
2058	-0.41
2059	-0.427
2060	-0.446
2061	-0.463
2062	-0.481
2063	-0.499
2064	-0.517
2065	-0.534
2066	-0.551
2067	-0.57
2068	-0.589
2069	-0.609
2070	-0.63
2071	-0.651
2072	-0.671
2073	-0.691
2074	-0.71
2075	-0.728
2076	-0.746
2077	-0.762
2078	-0.778
2079	-0.793
2080	-0.807
2081	-0.819
2082	-0.829
2083	-0.839
2084	-0.846
2085	-0.852
2086	-0.858
2087	-0.863
2088	-0.866
2089	-0.869
2090	-0.872
2091	-0.874
2092	-0.876
2093	-0.876
2094	-0.879
2095	-0.88
2096	-0.883
2097	-0.886
2098	-0.888
2099	-0.893