Year	Percent
1950	26.2311
1955	28.03734
1960	29.24321
1965	26.95309
1970	23.3689
1975	24.02779
1980	26.13132
1985	29.49057
1990	30.7904
1995	30.48069
2000	30.64341
2005	31.78518
2010	34.19698
2015	35.77707
2020	35.23962
2025	33.18712
2030	31.44777
2035	30.35328
2040	30.39393
2045	30.62333
2050	29.58187
2055	28.00988
2060	26.80963
2065	26.29276
2070	26.11326
2075	25.78851
2080	25.16399
2085	24.4358
2090	23.89148
2095	23.60572
2100	23.45771