Year	Percent
1950	16.09448
1955	17.99522
1960	18.49235
1965	15.00926
1970	11.35686
1975	9.90438
1980	8.02612
1985	7.97036
1990	7.57569
1995	8.58109
2000	6.52901
2005	5.75641
2010	5.15276
2015	4.76787
2020	4.45489
2025	4.1884
2030	4.03199
2035	3.83303
2040	3.63796
2045	3.4974
2050	3.42604
2055	3.40152
2060	3.39972
2065	3.39052
2070	3.36545
2075	3.33372
2080	3.31703
2085	3.30605
2090	3.30391
2095	3.30115
2100	3.28571