Year	Percent
1950	31.38502
1955	28.98624
1960	25.43738
1965	24.60224
1970	26.18975
1975	28.5247
1980	31.34632
1985	33.15121
1990	33.66512
1995	31.17181
2000	31.29046
2005	31.03971
2010	30.5187
2015	28.63181
2020	28.00487
2025	28.412
2030	29.50003
2035	29.65392
2040	29.08143
2045	28.29239
2050	27.59219
2055	27.24087
2060	27.10024
2065	26.89068
2070	26.47417
2075	25.89449
2080	25.28457
2085	24.75873
2090	24.32847
2095	23.93675
2100	23.51185