Year	Percent
1950	9.26199
1955	7.73616
1960	7.45789
1965	7.55195
1970	7.43941
1975	7.13122
1980	6.83821
1985	7.21573
1990	7.08504
1995	7.43965
2000	7.48439
2005	5.81973
2010	4.4348
2015	4.87273
2020	5.90815
2025	5.52598
2030	5.49781
2035	5.22563
2040	4.81149
2045	4.69747
2050	4.93847
2055	5.19216
2060	5.23781
2065	5.10976
2070	4.94109
2075	4.85543
2080	4.92064
2085	5.05687
2090	5.12819
2095	5.07058
2100	4.94028