Year	Percent
1950	29.19505
1955	27.00854
1960	25.84587
1965	26.47789
1970	28.58282
1975	29.96822
1980	31.04173
1985	31.54284
1990	31.20135
1995	30.87883
2000	29.55974
2005	26.67481
2010	25.19676
2015	25.20783
2020	25.56943
2025	26.13505
2030	26.06932
2035	24.53749
2040	23.58538
2045	23.47785
2050	23.44351
2055	23.98485
2060	24.15832
2065	23.83526
2070	23.30658
2075	22.92833
2080	22.80755
2085	22.85243
2090	22.85561
2095	22.65105
2100	22.29268