Year	Percent
1950	27.05914
1955	27.32499
1960	27.51232
1965	27.66277
1970	27.7404
1975	26.30991
1980	25.06674
1985	24.2431
1990	23.79371
1995	23.63851
2000	24.50755
2005	26.41392
2010	29.17928
2015	32.08323
2020	33.06399
2025	33.21353
2030	33.03301
2035	32.78916
2040	32.92187
2045	32.8627
2050	32.38787
2055	31.53638
2060	30.62597
2065	29.76543
2070	28.93099
2075	28.0233
2080	27.0321
2085	26.00828
2090	25.02102
2095	24.17476
2100	23.50327