Year	Percent
1950	30.69805
1955	30.6969
1960	30.63816
1965	29.56634
1970	28.48783
1975	26.91311
1980	26.99861
1985	27.75183
1990	28.03148
1995	29.00554
2000	29.82489
2005	29.08552
2010	29.31122
2015	29.40316
2020	29.13655
2025	29.09994
2030	28.50517
2035	27.4213
2040	26.54114
2045	25.88954
2050	25.29825
2055	24.72325
2060	24.10921
2065	23.51603
2070	23.00714
2075	22.61631
2080	22.32586
2085	22.08794
2090	21.8676
2095	21.65057
2100	21.45773