Year	Percent
1950	15.90233
1955	15.14573
1960	17.04354
1965	17.25979
1970	17.38606
1975	17.43755
1980	15.85947
1985	14.53946
1990	13.47568
1995	13.69123
2000	14.10285
2005	13.29341
2010	12.51835
2015	13.11108
2020	11.95991
2025	10.84369
2030	10.42587
2035	10.24629
2040	10.25639
2045	10.02318
2050	9.44452
2055	8.70284
2060	8.10085
2065	7.79633
2070	7.63293
2075	7.41122
2080	7.02536
2085	6.56268
2090	6.15312
2095	5.90092
2100	5.75585