Year	Percent
1950	17.3035
1955	15.43954
1960	16.46775
1965	17.15715
1970	17.14494
1975	17.68818
1980	15.22764
1985	16.02228
1990	14.64342
1995	13.53615
2000	12.09163
2005	10.67369
2010	10.10111
2015	10.37806
2020	9.45343
2025	8.72333
2030	8.03955
2035	7.47924
2040	7.06932
2045	6.78855
2050	6.54622
2055	6.31163
2060	6.07327
2065	5.87558
2070	5.72472
2075	5.61051
2080	5.523
2085	5.43553
2090	5.34745
2095	5.25977
2100	5.18909