Year	Percent
1950	10.21253
1955	10.00454
1960	9.67207
1965	9.81131
1970	10.32342
1975	10.50948
1980	10.95723
1985	11.05117
1990	10.75175
1995	10.80121
2000	10.28424
2005	10.2472
2010	9.7116
2015	8.85065
2020	8.40694
2025	8.13668
2030	8.02797
2035	7.60942
2040	7.16522
2045	6.75799
2050	6.42826
2055	6.17781
2060	5.97439
2065	5.77038
2070	5.56384
2075	5.38453
2080	5.24646
2085	5.14469
2090	5.0667
2095	4.99901
2100	4.93422