Year	Percent
1950	10.08946
1955	8.2614
1960	7.17938
1965	7.4201
1970	9.57896
1975	10.87365
1980	10.96646
1985	10.63354
1990	10.41225
1995	9.98087
2000	10.16131
2005	10.28423
2010	9.6961
2015	7.17954
2020	6.44193
2025	6.59779
2030	6.73762
2035	6.53655
2040	6.33906
2045	5.78543
2050	5.31699
2055	5.23573
2060	5.35698
2065	5.43474
2070	5.37871
2075	5.21149
2080	5.04483
2085	4.99359
2090	5.05453
2095	5.12062
2100	5.11114