Year	Percent
1950	15.34551
1955	16.29484
1960	15.59601
1965	15.15772
1970	14.89306
1975	14.43388
1980	14.09801
1985	14.75114
1990	15.8776
1995	17.69124
2000	20.21552
2005	23.18185
2010	25.61414
2015	26.43587
2020	25.97489
2025	25.89303
2030	26.43125
2035	27.22327
2040	27.89538
2045	26.66618
2050	25.78154
2055	24.75589
2060	24.37611
2065	24.92374
2070	24.89101
2075	24.49495
2080	23.9715
2085	23.54849
2090	23.35233
2095	23.34162
2100	23.3626