Year	Percent
1950	6.45307
1955	6.80272
1960	7.11667
1965	6.84411
1970	6.51119
1975	7.08008
1980	6.73644
1985	5.56476
1990	4.96977
1995	4.94334
2000	5.74134
2005	5.45744
2010	4.93081
2015	4.97323
2020	4.69026
2025	4.5482
2030	4.44396
2035	4.41027
2040	4.40282
2045	4.40328
2050	4.40103
2055	4.41093
2060	4.43489
2065	4.46495
2070	4.49979
2075	4.52227
2080	4.5215
2085	4.51117
2090	4.49588
2095	4.48116
2100	4.47119