Year	Percent
1950	21.58007
1955	22.0748
1960	19.99556
1965	19.4996
1970	21.30581
1975	23.12494
1980	26.39285
1985	24.6278
1990	22.93789
1995	23.40267
2000	25.18076
2005	28.74795
2010	29.37276
2015	28.96727
2020	27.74864
2025	27.78252
2030	29.28431
2035	29.21935
2040	27.3576
2045	24.56075
2050	22.37377
2055	22.55088
2060	24.09803
2065	25.36179
2070	25.23076
2075	24.01639
2080	23.15532
2085	23.04815
2090	23.57399
2095	24.10663
2100	24.09307