Year	Percent
1950	19.66581
1955	15.8617
1960	17.0991
1965	18.80083
1970	19.31116
1975	19.54207
1980	18.8567
1985	17.19144
1990	18.13438
1995	15.83739
2000	14.28544
2005	13.13839
2010	11.67438
2015	10.90376
2020	10.19763
2025	9.55043
2030	8.88339
2035	8.20689
2040	7.60238
2045	7.12821
2050	6.78411
2055	6.52232
2060	6.30212
2065	6.09292
2070	5.91684
2075	5.7679
2080	5.67777
2085	5.6162
2090	5.5672
2095	5.51922
2100	5.4717