Year	Percent
1950	11.70346
1955	12.18251
1960	12.03175
1965	14.73803
1970	14.95025
1975	12.94316
1980	11.64127
1985	10.20276
1990	10.01955
1995	10.62805
2000	9.72208
2005	9.07165
2010	8.02206
2015	7.69284
2020	7.71781
2025	7.74616
2030	7.35861
2035	7.02428
2040	6.78747
2045	6.57247
2050	6.02361
2055	5.54138
2060	5.28736
2065	5.20336
2070	5.18118
2075	5.1233
2080	5.02383
2085	4.91518
2090	4.85453
2095	4.86942
2100	4.90711