Year	Percent
1950	15.2682
1955	16.10712
1960	19.20023
1965	20.01128
1970	19.49963
1975	18.76438
1980	18.3036
1985	20.16099
1990	19.16161
1995	15.36763
2000	11.61212
2005	9.67477
2010	9.7008
2015	10.17327
2020	9.21848
2025	7.66731
2030	6.2913
2035	5.61565
2040	5.58505
2045	5.70704
2050	5.55624
2055	5.11633
2060	4.6657
2065	4.43213
2070	4.45652
2075	4.58163
2080	4.63565
2085	4.5519
2090	4.40577
2095	4.31364
2100	4.32754