Year	Percent
1950	8.68955
1955	8.89602
1960	7.55753
1965	6.86211
1970	7.03637
1975	7.63992
1980	7.43143
1985	6.5095
1990	6.93641
1995	6.53019
2000	7.49005
2005	8.08798
2010	6.24622
2015	4.37876
2020	4.66399
2025	5.67165
2030	5.61753
2035	5.46836
2040	5.22772
2045	4.84081
2050	4.71573
2055	5.0434
2060	5.42925
2065	5.53118
2070	5.39064
2075	5.17932
2080	5.05376
2085	5.10604
2090	5.25538
2095	5.35338
2100	5.3139