Year	Percent
1950	19.84064
1955	17.97862
1960	20.32959
1965	18.64962
1970	13.57783
1975	13.73637
1980	13.16331
1985	14.54567
1990	15.37135
1995	11.78994
2000	10.28843
2005	9.00154
2010	9.26278
2015	9.30137
2020	8.75508
2025	7.73209
2030	6.74677
2035	6.20106
2040	6.0533
2045	5.94809
2050	5.66795
2055	5.24638
2060	4.84466
2065	4.62597
2070	4.58951
2075	4.60972
2080	4.56035
2085	4.42329
2090	4.25692
2095	4.15562
2100	4.15896