Year	Percent
1950	16.26112
1955	16.30063
1960	16.24982
1965	18.56287
1970	20.1204
1975	19.73562
1980	20.13291
1985	17.66505
1990	17.56561
1995	17.44271
2000	16.70274
2005	17.29487
2010	16.64645
2015	15.83305
2020	14.7965
2025	14.07905
2030	13.51207
2035	12.9137
2040	12.27124
2045	11.66347
2050	11.07995
2055	10.54742
2060	10.05505
2065	9.62471
2070	9.22955
2075	8.85053
2080	8.47346
2085	8.13121
2090	7.79962
2095	7.50273
2100	7.22421