Year	Percent
1950	9.37967
1955	9.33605
1960	9.56999
1965	9.3106
1970	10.67551
1975	10.71834
1980	10.77418
1985	10.90191
1990	10.70615
1995	10.28503
2000	10.04117
2005	9.98543
2010	9.5968
2015	9.12223
2020	8.4895
2025	8.25176
2030	7.9735
2035	7.62711
2040	7.25036
2045	6.89536
2050	6.58404
2055	6.30845
2060	6.05721
2065	5.82895
2070	5.61994
2075	5.44058
2080	5.28871
2085	5.16119
2090	5.05878
2095	4.96857
2100	4.89