Year	Percent
1950	19.25285
1955	20.00838
1960	20.14718
1965	19.5205
1970	18.96599
1975	19.67008
1980	20.63038
1985	21.057
1990	19.59506
1995	12.53771
2000	16.35958
2005	16.17378
2010	16.02144
2015	14.91496
2020	13.59979
2025	12.42931
2030	11.65512
2035	11.11152
2040	10.51155
2045	9.75
2050	8.94333
2055	8.24311
2060	7.69893
2065	7.25053
2070	6.85458
2075	6.45566
2080	6.09046
2085	5.78612
2090	5.55759
2095	5.38497
2100	5.25017