Year	Percent
1950	31.88915
1955	32.60314
1960	36.4941
1965	34.1174
1970	32.10022
1975	32.99027
1980	32.92099
1985	35.3655
1990	33.55609
1995	32.13145
2000	31.08028
2005	32.11465
2010	34.2567
2015	33.1534
2020	29.94809
2025	26.53683
2030	23.68436
2035	24.66728
2040	27.1441
2045	28.36059
2050	27.9765
2055	26.17475
2060	25.11712
2065	25.13742
2070	25.94222
2075	26.62268
2080	26.46403
2085	25.56643
2090	24.61683
2095	24.17179
2100	24.26088