Year	Percent
1950	14.19423
1955	13.62327
1960	12.55428
1965	12.11257
1970	11.7192
1975	11.49407
1980	11.2778
1985	10.78745
1990	10.66613
1995	11.01746
2000	11.65403
2005	12.59165
2010	13.91421
2015	15.40827
2020	17.32007
2025	19.47282
2030	21.57865
2035	23.73693
2040	25.5091
2045	26.76774
2050	27.2699
2055	26.94314
2060	26.49139
2065	26.0402
2070	25.81763
2075	25.78262
2080	25.51556
2085	25.09299
2090	24.63649
2095	24.26392
2100	23.98368