Year	Percent
1950	27.30742
1955	27.15992
1960	26.90061
1965	26.90574
1970	27.19899
1975	27.88694
1980	29.52274
1985	32.93249
1990	34.00166
1995	31.86259
2000	33.83634
2005	35.86747
2010	37.20967
2015	37.56425
2020	34.98653
2025	32.08677
2030	30.25593
2035	28.99758
2040	29.08354
2045	29.01476
2050	28.13692
2055	26.80504
2060	25.22612
2065	24.20723
2070	23.85775
2075	23.82172
2080	23.69171
2085	23.24077
2090	22.56693
2095	21.96385
2100	21.64153