Year	Percent
1950	15.48792
1955	17.27046
1960	17.53356
1965	18.70085
1970	20.30189
1975	20.08957
1980	18.46166
1985	16.04249
1990	14.51864
1995	12.15907
2000	10.62953
2005	9.91377
2010	10.00684
2015	10.10275
2020	8.87114
2025	7.83105
2030	7.00775
2035	6.51792
2040	6.31258
2045	6.2027
2050	6.00977
2055	5.72084
2060	5.43514
2065	5.26072
2070	5.20392
2075	5.20961
2080	5.19636
2085	5.12557
2090	5.0133
2095	4.92467
2100	4.88362