Year	Percent
1950	3.071
1951	3.127
1952	3.224
1953	3.294
1954	3.343
1955	3.375
1956	3.391
1957	3.397
1958	3.393
1959	3.382
1960	3.363
1961	3.335
1962	3.299
1963	3.253
1964	3.198
1965	3.138
1966	3.076
1967	3.014
1968	2.953
1969	2.892
1970	2.833
1971	2.773
1972	2.714
1973	2.655
1974	2.595
1975	2.537
1976	2.48
1977	2.428
1978	2.382
1979	2.341
1980	2.304
1981	2.268
1982	2.231
1983	2.195
1984	2.157
1985	2.119
1986	2.081
1987	2.046
1988	2.016
1989	1.99
1990	1.968
1991	1.945
1992	1.914
1993	1.869
1994	1.812
1995	1.749
1996	1.688
1997	1.637
1998	1.601
1999	1.579
2000	1.565
2001	1.55
2002	1.532
2003	1.51
2004	1.482
2005	1.453
2006	1.424
2007	1.395
2008	1.367
2009	1.339
2010	1.31
2011	1.282
2012	1.252
2013	1.22
2014	1.187
2015	1.154
2016	1.12
2017	1.088
2018	1.056
2019	1.025
2020	0.994
2021	0.964
2022	0.934
2023	0.906
2024	0.879
2025	0.853
2026	0.827
2027	0.801
2028	0.773
2029	0.745
2030	0.716
2031	0.687
2032	0.66
2033	0.634
2034	0.61
2035	0.587
2036	0.565
2037	0.541
2038	0.516
2039	0.489
2040	0.462
2041	0.435
2042	0.408
2043	0.382
2044	0.356
2045	0.33
2046	0.305
2047	0.281
2048	0.258
2049	0.236
2050	0.215
2051	0.195
2052	0.175
2053	0.155
2054	0.136
2055	0.117
2056	0.098
2057	0.08
2058	0.062
2059	0.045
2060	0.028
2061	0.012
2062	-0.004
2063	-0.02
2064	-0.036
2065	-0.052
2066	-0.067
2067	-0.083
2068	-0.098
2069	-0.113
2070	-0.128
2071	-0.144
2072	-0.158
2073	-0.173
2074	-0.188
2075	-0.202
2076	-0.216
2077	-0.23
2078	-0.244
2079	-0.258
2080	-0.271
2081	-0.285
2082	-0.298
2083	-0.311
2084	-0.324
2085	-0.336
2086	-0.348
2087	-0.36
2088	-0.371
2089	-0.382
2090	-0.392
2091	-0.403
2092	-0.413
2093	-0.422
2094	-0.431
2095	-0.44
2096	-0.449
2097	-0.457
2098	-0.465
2099	-0.472