Year	Percent
1950	13.14262
1955	13.45251
1960	14.2498
1965	14.43179
1970	14.72327
1975	14.49264
1980	13.85158
1985	13.64696
1990	12.65431
1995	12.22288
2000	11.59142
2005	10.46614
2010	9.75597
2015	9.25514
2020	8.97485
2025	8.3797
2030	7.78601
2035	7.25438
2040	6.81914
2045	6.47639
2050	6.19276
2055	5.91957
2060	5.65385
2065	5.42461
2070	5.24378
2075	5.1063
2080	4.99894
2085	4.9076
2090	4.82362
2095	4.74713
2100	4.69024