Year	Percent
1950	9.72009
1955	6.29422
1960	6.68108
1965	8.04853
1970	9.56232
1975	8.47086
1980	6.8692
1985	6.69558
1990	6.73942
1995	7.39098
2000	7.28275
2005	5.63295
2010	4.38419
2015	4.24874
2020	4.93536
2025	5.60579
2030	5.48139
2035	5.15444
2040	4.7337
2045	4.58566
2050	4.84698
2055	5.23885
2060	5.42567
2065	5.32648
2070	5.11871
2075	5.01731
2080	5.0994
2085	5.27924
2090	5.37814
2095	5.32128
2100	5.17212