Year	Percent
1950	9.83161
1955	11.07349
1960	11.3645
1965	11.64033
1970	11.12024
1975	9.60656
1980	8.98907
1985	8.52123
1990	8.16383
1995	7.79235
2000	8.0364
2005	7.0599
2010	6.63563
2015	6.8173
2020	6.52168
2025	6.13102
2030	5.88148
2035	5.60389
2040	5.38258
2045	5.27102
2050	5.21271
2055	5.13496
2060	5.02244
2065	4.91463
2070	4.82311
2075	4.76347
2080	4.73141
2085	4.70353
2090	4.66638
2095	4.61731
2100	4.57372