Year	Percent
1950	26.27896
1955	29.31225
1960	31.60677
1965	31.61502
1970	29.25649
1975	29.96955
1980	30.24042
1985	31.82087
1990	30.9454
1995	30.0397
2000	28.31084
2005	28.26531
2010	27.94248
2015	27.23372
2020	26.38676
2025	24.95935
2030	24.26708
2035	23.41656
2040	22.65798
2045	22.17282
2050	21.51805
2055	21.02652
2060	20.72754
2065	20.5398
2070	20.40827
2075	20.29313
2080	20.15932
2085	20.04505
2090	19.98003
2095	19.95932
2100	19.94568