Year	Percent
1950	16.68928
1955	18.35393
1960	18.12199
1965	17.98408
1970	15.74665
1975	14.83689
1980	14.35065
1985	14.28427
1990	13.51866
1995	12.66878
2000	11.57718
2005	9.8857
2010	8.64131
2015	8.36289
2020	8.20784
2025	7.86603
2030	7.23176
2035	6.51965
2040	5.98427
2045	5.71773
2050	5.64365
2055	5.58098
2060	5.42192
2065	5.19182
2070	4.98334
2075	4.87082
2080	4.86305
2085	4.89518
2090	4.88906
2095	4.82378
2100	4.73991