Year	Percent
1950	30.92167
1955	27.89406
1960	24.96325
1965	23.73102
1970	25.0233
1975	26.81566
1980	28.95428
1985	30.13466
1990	30.27718
1995	30.02896
2000	28.65416
2005	27.17343
2010	26.48073
2015	26.86323
2020	26.8866
2025	26.40667
2030	25.78947
2035	24.96955
2040	24.49778
2045	24.37678
2050	24.18348
2055	24.1309
2060	23.86766
2065	23.50672
2070	23.16508
2075	22.90468
2080	22.71755
2085	22.54847
2090	22.33837
2095	22.07449
2100	21.8004