Year	Percent
1950	11.0622
1955	10.31447
1960	10.01089
1965	12.63224
1970	12.28185
1975	12.18755
1980	11.98887
1985	12.34522
1990	12.75086
1995	12.67044
2000	12.81525
2005	12.62973
2010	12.46087
2015	12.76842
2020	13.07204
2025	12.73135
2030	12.35688
2035	12.08612
2040	11.86349
2045	11.60635
2050	11.30299
2055	10.95214
2060	10.57616
2065	10.20623
2070	9.85534
2075	9.52624
2080	9.20587
2085	8.88302
2090	8.57282
2095	8.28423
2100	8.00568