Year	Percent
1950	9.76995
1955	8.87642
1960	8.18603
1965	9.19068
1970	9.45411
1975	8.07111
1980	8.05713
1985	7.83397
1990	7.58018
1995	8.08159
2000	7.36046
2005	6.54114
2010	5.22939
2015	4.76252
2020	4.56718
2025	5.24574
2030	5.48173
2035	5.28685
2040	4.9459
2045	4.65128
2050	4.62164
2055	4.88449
2060	5.21304
2065	5.35303
2070	5.26812
2075	5.10406
2080	5.02543
2085	5.08603
2090	5.20786
2095	5.27954
2100	5.23126