Year	Percent
1950	27.77744
1955	28.41193
1960	28.79027
1965	27.9001
1970	27.17467
1975	27.59112
1980	29.16074
1985	31.95312
1990	34.48603
1995	34.86861
2000	34.72642
2005	33.4264
2010	30.89788
2015	27.86237
2020	26.3246
2025	25.38744
2030	24.70778
2035	23.36688
2040	21.67748
2045	20.43082
2050	19.60195
2055	19.13066
2060	19.14882
2065	19.30006
2070	19.30261
2075	19.1781
2080	19.08776
2085	19.11364
2090	19.26253
2095	19.47209
2100	19.62237