Year	Percent
1950	13.23342
1955	13.26769
1960	12.91327
1965	14.03846
1970	14.65758
1975	15.04939
1980	14.33917
1985	14.57049
1990	14.18488
1995	13.41437
2000	12.32198
2005	11.53231
2010	10.8859
2015	9.7493
2020	8.93055
2025	8.2841
2030	7.63655
2035	7.02558
2040	6.46915
2045	6.01083
2050	5.67485
2055	5.40441
2060	5.17779
2065	4.9924
2070	4.84211
2075	4.73257
2080	4.65082
2085	4.59632
2090	4.56349
2095	4.54195
2100	4.53299