Year	Percent
1950	14.81763
1955	15.13928
1960	18.89177
1965	19.30499
1970	19.71013
1975	16.6325
1980	14.60363
1985	13.45453
1990	12.86405
1995	12.33192
2000	10.38785
2005	7.88199
2010	6.62227
2015	6.2906
2020	5.98942
2025	5.62648
2030	5.26333
2035	4.87941
2040	4.53809
2045	4.34361
2050	4.27102
2055	4.23745
2060	4.18444
2065	4.10568
2070	4.03617
2075	4.0171
2080	4.05309
2085	4.12197
2090	4.19067
2095	4.23218
2100	4.24961