Year	Percent
1950	10.10392
1955	9.43956
1960	8.86648
1965	8.56489
1970	10.81677
1975	10.38723
1980	10.2075
1985	10.0541
1990	10.32892
1995	10.69954
2000	10.6481
2005	10.68242
2010	10.47639
2015	10.40352
2020	10.75624
2025	11.09184
2030	10.87592
2035	10.63487
2040	10.48615
2045	10.38046
2050	10.24216
2055	10.05587
2060	9.81836
2065	9.55033
2070	9.28152
2075	9.02464
2080	8.78251
2085	8.54223
2090	8.29506
2095	8.05385
2100	7.82846