Year	Percent
1950	22.52354
1955	23.2988
1960	20.94039
1965	21.52447
1970	21.59655
1975	21.1703
1980	21.73865
1985	20.68475
1990	21.19928
1995	23.40716
2000	26.07288
2005	27.75878
2010	28.06851
2015	27.89158
2020	28.76208
2025	29.74519
2030	30.91835
2035	30.58534
2040	28.0867
2045	25.4484
2050	23.65537
2055	22.77629
2060	23.26993
2065	24.11432
2070	24.15513
2075	23.69624
2080	23.11628
2085	22.78296
2090	22.86413
2095	23.19305
2100	23.37462