Year	Percent
1950	16.68828
1955	18.71318
1960	18.5497
1965	18.12777
1970	17.94903
1975	18.2365
1980	15.9842
1985	14.15614
1990	13.16032
1995	12.2829
2000	11.59846
2005	10.5046
2010	9.49233
2015	8.92339
2020	8.19354
2025	7.48087
2030	6.83733
2035	6.31255
2040	5.89649
2045	5.57709
2050	5.31009
2055	5.0856
2060	4.88065
2065	4.72902
2070	4.61208
2075	4.53251
2080	4.4746
2085	4.42611
2090	4.391
2095	4.36308
2100	4.34668