Year	Percent
1950	10.3992
1955	9.42332
1960	12.05165
1965	11.89073
1970	12.41295
1975	12.4118
1980	12.30813
1985	11.76153
1990	11.8456
1995	12.50597
2000	12.91723
2005	11.12406
2010	9.88489
2015	9.66507
2020	9.65672
2025	11.21628
2030	10.17596
2035	9.20703
2040	8.6335
2045	8.57381
2050	8.61384
2055	8.34433
2060	7.92724
2065	7.51552
2070	7.21263
2075	7.01857
2080	6.8159
2085	6.57285
2090	6.30871
2095	6.075
2100	5.89047