Year	Percent
1950	12.44731
1955	16.36334
1960	17.88227
1965	17.35697
1970	16.27544
1975	15.71447
1980	14.69693
1985	14.13651
1990	13.50487
1995	12.23461
2000	9.02345
2005	8.01816
2010	8.22563
2015	8.28549
2020	7.77298
2025	7.29246
2030	6.48054
2035	5.88809
2040	5.72324
2045	5.76182
2050	5.74455
2055	5.59725
2060	5.36019
2065	5.14913
2070	5.07156
2075	5.11729
2080	5.17761
2085	5.17288
2090	5.09184
2095	4.99107
2100	4.92921