Year	Percent
1950	13.23716
1955	13.55026
1960	14.35547
1965	14.53432
1970	14.84648
1975	14.60528
1980	14.04548
1985	13.85566
1990	12.84879
1995	12.41107
2000	11.78763
2005	10.72746
2010	9.98465
2015	9.44973
2020	9.16337
2025	8.56763
2030	7.97116
2035	7.43715
2040	6.99607
2045	6.64726
2050	6.3566
2055	6.07418
2060	5.79752
2065	5.5578
2070	5.36778
2075	5.22293
2080	5.10961
2085	5.0136
2090	4.92552
2095	4.84618
2100	4.78737