Year	Percent
1950	15.75473
1955	20.56842
1960	19.36262
1965	18.22671
1970	17.73338
1975	18.0039
1980	16.9734
1985	17.34952
1990	16.2083
1995	15.22639
2000	15.04235
2005	13.50692
2010	11.75655
2015	10.98116
2020	10.53926
2025	9.91343
2030	9.12626
2035	8.36112
2040	7.7536
2045	7.31565
2050	6.98136
2055	6.66716
2060	6.36446
2065	6.08026
2070	5.85423
2075	5.69019
2080	5.56745
2085	5.46838
2090	5.3684
2095	5.26992
2100	5.18334