Year	Percent
1950	16.74303
1955	16.85569
1960	17.12764
1965	16.6704
1970	15.58057
1975	15.07274
1980	16.66329
1985	18.21555
1990	20.30804
1995	23.58428
2000	27.71936
2005	29.79427
2010	31.14872
2015	29.94367
2020	27.34273
2025	24.63979
2030	23.20962
2035	23.07793
2040	24.11734
2045	24.91161
2050	25.19017
2055	25.0721
2060	24.94852
2065	24.81023
2070	24.88404
2075	24.58756
2080	24.10716
2085	23.71039
2090	23.46497
2095	23.32067
2100	23.20045