Year	Percent
1950	12.09291
1955	13.9195
1960	15.55631
1965	16.36563
1970	16.80273
1975	16.92109
1980	13.41678
1985	10.68915
1990	11.48619
1995	11.54118
2000	10.87555
2005	10.42798
2010	9.55478
2015	8.93317
2020	8.63035
2025	8.18084
2030	7.7535
2035	7.35265
2040	6.98121
2045	6.66163
2050	6.41102
2055	6.19826
2060	6.01361
2065	5.83435
2070	5.67173
2075	5.53351
2080	5.41449
2085	5.32812
2090	5.25077
2095	5.18277
2100	5.11631