Year	Percent
1950	30.75713
1955	29.21753
1960	27.43217
1965	26.045
1970	27.74296
1975	30.72943
1980	33.65061
1985	35.48228
1990	34.36933
1995	32.04114
2000	29.59946
2005	27.66043
2010	27.41409
2015	27.42917
2020	26.77729
2025	25.3549
2030	24.55552
2035	23.6373
2040	23.47761
2045	23.72105
2050	23.5517
2055	23.23771
2060	22.89184
2065	22.63182
2070	22.48674
2075	22.44542
2080	22.37891
2085	22.21648
2090	21.98125
2095	21.73911
2100	21.52994