Year	Percent
1950	10.38071
1955	10.59837
1960	10.49529
1965	10.89089
1970	11.51675
1975	12.53844
1980	11.88924
1985	10.31488
1990	9.99015
1995	10.59268
2000	10.94459
2005	9.40769
2010	9.46241
2015	8.57682
2020	8.52727
2025	9.03907
2030	8.74561
2035	8.19154
2040	7.75974
2045	7.52297
2050	7.37044
2055	7.16874
2060	6.93114
2065	6.68589
2070	6.44644
2075	6.236
2080	6.06343
2085	5.93549
2090	5.82032
2095	5.69521
2100	5.58199