Year	Percent
1950	31.09699
1955	30.19799
1960	29.15125
1965	27.97375
1970	27.22943
1975	28.12367
1980	29.04978
1985	29.98215
1990	30.73174
1995	30.80512
2000	31.00664
2005	31.56933
2010	32.1754
2015	32.71893
2020	33.0328
2025	32.90722
2030	32.46368
2035	31.50703
2040	30.53875
2045	29.52888
2050	28.58752
2055	27.9497
2060	27.16006
2065	26.33018
2070	25.57596
2075	24.98186
2080	24.55416
2085	24.21094
2090	23.85891
2095	23.50173
2100	23.17222