Year	Percent
1950	13.45079
1955	14.58111
1960	17.1985
1965	17.76969
1970	16.86543
1975	14.6156
1980	13.19912
1985	12.93415
1990	12.09463
1995	11.48997
2000	10.8782
2005	9.38155
2010	8.18423
2015	7.19345
2020	7.81341
2025	7.1623
2030	6.45203
2035	5.8095
2040	5.33172
2045	5.0826
2050	4.95559
2055	4.81424
2060	4.57747
2065	4.27351
2070	4.04791
2075	3.9367
2080	3.91851
2085	3.91257
2090	3.85293
2095	3.73645
2100	3.61818