Year	Percent
1948	29.00
1949	29.84
1950	30.69
1951	31.57
1952	32.47
1953	33.40
1954	34.35
1955	35.34
1956	36.34
1957	37.37
1958	38.41
1959	39.48
1960	40.56
1961	41.65
1962	42.75
1963	43.86
1964	45.00
1965	45.87
1966	46.80
1967	47.73
1968	48.65
1969	49.58
1970	50.50
1971	51.41
1972	52.31
1973	53.21
1974	54.09
1975	54.97
1976	55.83
1977	56.68
1978	57.51
1979	58.32
1980	59.12
1981	59.90
1982	60.67
1983	61.41
1984	62.14
1985	62.84
1986	63.53
1987	64.19
1988	64.83
1989	65.46
1990	66.06
1991	66.64
1992	67.20
1993	67.74
1994	68.26
1995	68.76
1996	69.24
1997	69.71
1998	70.15
1999	70.57
2000	70.98
2001	71.37
2002	71.74
2003	72.10
2004	72.44
2005	72.76
2006	73.07
2007	73.30
2008	70.95
2009	69.11
2010	67.65
2011	66.51
2012	65.61
2013	64.91
2014	64.35
2015	63.91
2016	63.40
2017	62.82
2018	62.28
2019	61.80
2020	61.36
2021	60.95
2022	60.56
2023	60.18
2024	59.65
2025	59.12
2026	58.60
2027	58.11
2028	57.55
2029	56.99
2030	56.42
2031	55.87
2032	55.33
2033	54.82
2034	54.14
2035	53.73
2036	53.37
2037	53.04
2038	52.76
2039	52.54
2040	52.36
2041	52.25
2042	52.16
2043	51.98
2044	51.81
2045	51.66
2046	51.51
2047	51.35
2048	51.19
2049	51.01
2050	50.69
2051	50.35
2052	50.02
2053	49.70
2054	49.33
2055	48.94
2056	48.63
2057	48.36
2058	48.11
2059	47.86
2060	47.45
2061	47.25
2062	47.03
2063	46.81
2064	46.64
2065	46.52
2066	46.46
2067	46.44
2068	46.45
2069	46.37
2070	46.31
2071	46.27
2072	46.24
2073	46.20
2074	46.16
2075	46.10
2076	45.92
2077	45.71
2078	45.50
2079	45.30
2080	45.04
2081	44.75
2082	44.47
2083	44.19
2084	43.99
2085	43.82
2086	43.51
2087	43.41
2088	43.33
2089	43.26
2090	43.17
2091	43.09
2092	43.05
2093	43.05
2094	43.10
2095	43.08
2096	43.09
2097	43.13
2098	43.16
2099	43.20
2100	43.23