Year	Percent
1950	13.98594
1955	16.28743
1960	17.43644
1965	17.58262
1970	17.42925
1975	17.43727
1980	17.77672
1985	18.34181
1990	18.00528
1995	16.97768
2000	16.16705
2005	15.63866
2010	15.31738
2015	14.92736
2020	14.06106
2025	13.19558
2030	12.44874
2035	11.8467
2040	11.32623
2045	10.81272
2050	10.28797
2055	9.75351
2060	9.27613
2065	8.8438
2070	8.47223
2075	8.09498
2080	7.72479
2085	7.3762
2090	7.05662
2095	6.78094
2100	6.5338