Year	Percent
1950	28.90349
1955	29.57101
1960	28.88237
1965	26.31314
1970	25.16179
1975	25.9246
1980	26.63672
1985	27.00106
1990	27.39907
1995	28.30114
2000	31.42026
2005	36.96748
2010	41.3933
2015	42.00423
2020	37.42206
2025	30.77978
2030	26.29709
2035	25.43907
2040	25.97403
2045	25.50394
2050	23.27047
2055	20.66641
2060	19.21942
2065	19.18759
2070	19.93335
2075	20.51171
2080	20.40211
2085	19.77631
2090	19.25522
2095	19.25178
2100	19.66758