Year	Percent
1950	22.59652
1955	23.32318
1960	21.31179
1965	21.59523
1970	22.74207
1975	23.91093
1980	25.94101
1985	25.37195
1990	24.03585
1995	23.69204
2000	24.45674
2005	26.43146
2010	27.97274
2015	28.62972
2020	27.26237
2025	25.30324
2030	24.80947
2035	25.03872
2040	24.94005
2045	23.97416
2050	22.64014
2055	21.40555
2060	21.55634
2065	22.89302
2070	23.66509
2075	23.30456
2080	22.62124
2085	22.00135
2090	21.9418
2095	22.4076
2100	22.83367