Year	Percent
1950	10.43299
1955	10.38906
1960	10.40418
1965	12.9792
1970	14.55564
1975	15.39216
1980	14.4783
1985	17.34276
1990	15.12648
1995	15.27749
2000	14.40125
2005	14.43809
2010	15.02495
2015	14.54388
2020	13.90985
2025	13.06535
2030	12.49036
2035	12.07041
2040	11.62982
2045	11.14316
2050	10.67521
2055	10.21182
2060	9.78614
2065	9.38617
2070	9.03442
2075	8.71137
2080	8.40155
2085	8.08835
2090	7.80467
2095	7.52435
2100	7.26949