Year	Percent
1950	29.49791
1955	29.35345
1960	28.8583
1965	28.65894
1970	27.65566
1975	25.6803
1980	24.40853
1985	24.00863
1990	24.55304
1995	25.57596
2000	27.12631
2005	29.36864
2010	31.82208
2015	32.93727
2020	31.58967
2025	30.16485
2030	29.60119
2035	30.21078
2040	30.9457
2045	31.24683
2050	30.86236
2055	29.90123
2060	29.12139
2065	28.72574
2070	28.48513
2075	28.17316
2080	27.67996
2085	27.04822
2090	26.39273
2095	25.82362
2100	25.35473