Year	Percent
1950	12.30845
1955	12.03499
1960	11.7787
1965	11.55627
1970	12.25751
1975	12.42441
1980	12.42641
1985	12.43132
1990	12.41678
1995	12.42313
2000	12.24517
2005	12.01119
2010	11.82504
2015	11.56056
2020	11.4722
2025	11.47233
2030	11.15304
2035	10.79235
2040	10.44436
2045	10.14681
2050	9.89101
2055	9.63723
2060	9.36661
2065	9.08682
2070	8.81733
2075	8.5674
2080	8.32796
2085	8.09724
2090	7.88598
2095	7.6823
2100	7.45527