Year	Percent
1950	10.91628
1955	12.04256
1960	14.50959
1965	14.65208
1970	14.50023
1975	14.11966
1980	13.85515
1985	14.72646
1990	15.75028
1995	14.84876
2000	11.46952
2005	7.93174
2010	7.32963
2015	8.04237
2020	8.12677
2025	7.03609
2030	5.75249
2035	4.83405
2040	4.58156
2045	4.76639
2050	4.93812
2055	4.79233
2060	4.42967
2065	4.12416
2070	4.07009
2075	4.25272
2080	4.49283
2085	4.5891
2090	4.50632
2095	4.35734
2100	4.29922