Year	Percent
1950	29.17249
1955	30.04037
1960	29.16775
1965	26.80203
1970	23.84789
1975	23.37685
1980	25.2059
1985	27.69227
1990	30.52894
1995	31.23335
2000	31.84677
2005	32.8005
2010	33.04293
2015	32.62898
2020	31.13632
2025	29.12969
2030	27.70671
2035	27.15474
2040	27.05816
2045	26.73909
2050	26.04243
2055	24.72984
2060	23.69037
2065	23.02314
2070	22.63034
2075	22.31186
2080	21.90874
2085	21.4024
2090	20.89767
2095	20.51059
2100	20.26783