Year	Percent
1950	5.2357
1955	5.04411
1960	4.74833
1965	4.47692
1970	4.17662
1975	3.96702
1980	3.76866
1985	3.49972
1990	3.43213
1995	3.56029
2000	3.44028
2005	3.41352
2010	3.57094
2015	3.72155
2020	3.99402
2025	4.35497
2030	4.82278
2035	5.45718
2040	6.31745
2045	7.31643
2050	8.43203
2055	9.79445
2060	11.61433
2065	13.73488
2070	15.93365
2075	17.7402
2080	19.44097
2085	20.98861
2090	22.44464
2095	23.83709
2100	25.16373