Year	Percent
1950	10.04175
1955	11.10289
1960	9.37819
1965	9.89246
1970	8.65801
1975	9.51293
1980	8.74449
1985	10.37405
1990	9.87131
1995	10.65631
2000	11.05765
2005	10.56693
2010	10.53832
2015	10.80714
2020	11.00723
2025	11.07799
2030	11.10893
2035	10.8998
2040	10.63921
2045	10.37065
2050	10.09515
2055	9.77543
2060	9.39356
2065	8.98883
2070	8.60555
2075	8.27202
2080	7.97701
2085	7.71783
2090	7.46513
2095	7.22387
2100	7.00436