Year	Percent
1950	29.10527
1955	26.97683
1960	25.75416
1965	26.10662
1970	27.83628
1975	28.98214
1980	29.89513
1985	30.32505
1990	29.9471
1995	29.78674
2000	28.71277
2005	26.13574
2010	24.81072
2015	24.69334
2020	24.98513
2025	25.56014
2030	25.54164
2035	24.10633
2040	23.24091
2045	23.13637
2050	23.13182
2055	23.63356
2060	23.77372
2065	23.43518
2070	22.90717
2075	22.53165
2080	22.40923
2085	22.45017
2090	22.4571
2095	22.27166
2100	21.93416