Year	Percent
1950	5.3062
1955	4.83852
1960	4.85781
1965	4.9134
1970	5.42042
1975	5.93035
1980	5.42134
1985	5.09256
1990	4.99368
1995	4.67698
2000	4.53521
2005	4.53855
2010	4.57458
2015	4.89233
2020	4.97008
2025	5.06774
2030	5.25275
2035	5.69975
2040	6.29626
2045	7.18344
2050	8.14331
2055	9.08522
2060	9.89975
2065	10.71159
2070	11.72653
2075	12.90639
2080	14.09504
2085	15.25032
2090	16.35574
2095	17.47149
2100	18.6369