Year	Percent
1950	11.22249
1955	11.89789
1960	13.60109
1965	12.16586
1970	11.04986
1975	11.00338
1980	9.79765
1985	9.04915
1990	8.94532
1995	8.45319
2000	7.75401
2005	6.55918
2010	5.95739
2015	5.40896
2020	5.54023
2025	5.52081
2030	5.35112
2035	5.06823
2040	4.79924
2045	4.67605
2050	4.70942
2055	4.80394
2060	4.84635
2065	4.79144
2070	4.70378
2075	4.6613
2080	4.69769
2085	4.77827
2090	4.82473
2095	4.81715
2100	4.75782