Year	Percent
1950	6.24383
1955	7.08737
1960	7.64973
1965	7.34324
1970	7.09837
1975	7.55518
1980	7.39701
1985	6.14289
1990	5.32183
1995	5.44039
2000	5.58713
2005	5.63476
2010	5.0761
2015	4.60791
2020	4.5768
2025	4.73171
2030	4.90903
2035	4.80629
2040	4.63393
2045	4.47282
2050	4.41457
2055	4.47761
2060	4.60102
2065	4.6764
2070	4.66474
2075	4.59378
2080	4.53495
2085	4.51863
2090	4.53185
2095	4.54573
2100	4.52784