Year	Percent
1950	29.27932
1955	31.23455
1960	33.31822
1965	31.18164
1970	30.26907
1975	30.35974
1980	29.92957
1985	30.46122
1990	29.23226
1995	28.05527
2000	27.46984
2005	27.67778
2010	27.73397
2015	27.22178
2020	26.26752
2025	25.56142
2030	24.27548
2035	23.37849
2040	22.93729
2045	22.53074
2050	22.37367
2055	22.16717
2060	21.86535
2065	21.56857
2070	21.38945
2075	21.33156
2080	21.32185
2085	21.29816
2090	21.19795
2095	21.03975
2100	20.89302