Year	Percent
1950	25.21551
1955	24.79954
1960	24.33077
1965	28.60072
1970	34.31851
1975	29.27721
1980	29.04623
1985	29.31231
1990	28.09091
1995	28.16411
2000	25.14395
2005	25.17696
2010	23.10337
2015	21.56853
2020	21.42326
2025	21.952
2030	23.49715
2035	23.62343
2040	23.51646
2045	23.25263
2050	22.46603
2055	21.88628
2060	21.53712
2065	21.19114
2070	20.57573
2075	19.76924
2080	19.01001
2085	18.43613
2090	18.06746
2095	17.81216
2100	17.56204