Year	Percent
1950	27.10552
1955	26.88534
1960	26.58475
1965	26.32119
1970	26.28088
1975	26.3079
1980	25.8395
1985	28.70743
1990	28.7596
1995	28.01289
2000	31.31337
2005	33.29637
2010	35.76066
2015	37.48804
2020	35.137
2025	31.93285
2030	29.55185
2035	28.12004
2040	28.63821
2045	29.13527
2050	28.48371
2055	27.15542
2060	25.4289
2065	24.255
2070	23.83834
2075	23.77868
2080	23.62982
2085	23.14327
2090	22.42277
2095	21.77799
2100	21.43224