Year	Percent
1950	10.31877
1955	9.06287
1960	8.18876
1965	9.41528
1970	10.41674
1975	10.54566
1980	10.58993
1985	10.67387
1990	11.11704
1995	11.6482
2000	12.04021
2005	11.80017
2010	10.74512
2015	11.0433
2020	11.07888
2025	11.05438
2030	10.3597
2035	9.96979
2040	9.6551
2045	9.40354
2050	9.1237
2055	8.78785
2060	8.44309
2065	8.14207
2070	7.85945
2075	7.59387
2080	7.33701
2085	7.07987
2090	6.81565
2095	6.57866
2100	6.38024