Year	Percent
1950	12.10078
1955	11.61384
1960	12.75189
1965	12.80595
1970	17.2389
1975	15.87595
1980	13.3397
1985	11.95324
1990	10.17417
1995	12.31859
2000	13.33707
2005	11.12298
2010	9.62294
2015	8.32779
2020	8.5529
2025	8.67285
2030	8.31429
2035	7.45267
2040	6.56057
2045	6.07495
2050	5.99739
2055	5.97641
2060	5.77979
2065	5.42551
2070	5.06841
2075	4.89075
2080	4.89607
2085	4.94752
2090	4.91183
2095	4.77197
2100	4.60303