Year	Percent
1950	28.3672
1955	27.44263
1960	26.09762
1965	25.45225
1970	23.86944
1975	24.24283
1980	24.2436
1985	25.81806
1990	27.77563
1995	28.29316
2000	29.55253
2005	31.06754
2010	32.46644
2015	32.82628
2020	32.47541
2025	31.77558
2030	31.9279
2035	32.77437
2040	33.19214
2045	33.09112
2050	32.34418
2055	31.23308
2060	30.52614
2065	30.05829
2070	29.56271
2075	28.85573
2080	28.00854
2085	27.13587
2090	26.3507
2095	25.69594
2100	25.11782