Year	Percent
1950	22.50035
1955	23.33048
1960	22.95376
1965	23.00951
1970	22.98864
1975	22.45703
1980	22.9041
1985	23.06698
1990	25.66175
1995	27.68872
2000	29.13434
2005	29.88783
2010	27.84806
2015	25.75229
2020	24.7222
2025	24.06155
2030	23.82667
2035	24.68585
2040	24.50988
2045	23.98035
2050	23.86458
2055	23.37256
2060	23.51166
2065	23.73109
2070	23.55067
2075	23.34273
2080	23.06055
2085	22.8359
2090	22.72614
2095	22.67257
2100	22.57189