Year	Percent
1950	31.13566
1955	29.87256
1960	27.19379
1965	24.17278
1970	22.48526
1975	23.43476
1980	25.75495
1985	28.90517
1990	31.42037
1995	32.40313
2000	33.22717
2005	34.11194
2010	34.79749
2015	34.84387
2020	32.6225
2025	29.67976
2030	27.171
2035	25.42152
2040	25.44073
2045	25.73606
2050	25.10284
2055	23.80946
2060	22.71583
2065	22.0049
2070	21.94403
2075	22.22721
2080	22.34943
2085	22.11153
2090	21.68919
2095	21.35479
2100	21.24696