Year	Percent
1950	17.62253
1955	16.71403
1960	17.19845
1965	17.43178
1970	17.59934
1975	20.09915
1980	19.38884
1985	17.86596
1990	16.94828
1995	16.30363
2000	15.59921
2005	15.21673
2010	14.84449
2015	13.85865
2020	12.74846
2025	12.01826
2030	11.52968
2035	11.08674
2040	10.5495
2045	9.95528
2050	9.35561
2055	8.84353
2060	8.4025
2065	8.02709
2070	7.65259
2075	7.27558
2080	6.90725
2085	6.57483
2090	6.28546
2095	6.05429
2100	5.84852