Year	Percent
1950	15.20732
1955	14.7162
1960	14.20196
1965	13.69436
1970	13.2763
1975	12.88583
1980	12.5209
1985	10.46931
1990	9.63625
1995	10.62033
2000	12.14202
2005	13.14963
2010	15.10872
2015	19.2925
2020	23.27069
2025	25.75821
2030	27.97127
2035	28.57725
2040	27.12374
2045	25.64179
2050	24.49082
2055	24.03273
2060	25.23358
2065	26.51003
2070	26.75211
2075	26.20843
2080	25.03837
2085	24.17824
2090	23.93841
2095	24.01817
2100	24.03561