year,month,value
1979,February,1.212360779
1979,September,7.027059294
1980,February,1.088808088
1980,September,7.266442632
1981,February,1.108113196
1981,September,7.181500157
1982,February,1.208499758
1982,September,7.084974618
1983,February,1.185333628
1983,September,7.177639136
1984,February,1.034753786
1984,September,7.015476229
1985,February,1.096530132
1985,September,7.220110373
1986,February,1.231665887
1986,September,6.826286171
1987,February,1.254832017
1987,September,7.046364402
1988,February,1.11583524
1988,September,7.069530531
1989,February,1.150584434
1989,September,6.996171121
1990,February,1.173750563
1990,September,7.023198272
1991,February,1.220082822
1991,September,7.069530531
1992,February,1.096530132
1992,September,7.007754186
1993,February,0.957533354
1993,September,7.158334028
1994,February,1.235526909
1994,September,7.185361179
1995,February,1.374523686
1995,September,7.092696661
1996,February,1.150584434
1996,September,7.193083222
1997,February,0.961394376
1997,September,7.181500157
1998,February,1.154445455
1998,September,7.297330805
1999,February,1.146723412
1999,September,7.220110373
2000,February,1.123557283
2000,September,7.293469784
2001,February,1.40927288
2001,September,7.015476229
2002,February,1.142862391
2002,September,6.907367625
2003,February,1.463327183
2003,September,7.06566951
2004,February,1.382245729
2004,September,7.305052848
2005,February,1.146723412
2005,September,7.258720589
2006,February,1.023170721
2006,September,7.370690215
2007,February,1.119696261
2007,September,7.281886719
2008,February,1.501937399
2008,September,7.007754186
2009,February,1.154445455
2009,September,7.320496935
2010,February,1.200777714
2010,September,7.258720589
2011,February,0.972977441
2011,September,7.23555446
2012,February,1.370662664
2012,September,7.417022474
2013,February,1.482632291
2013,September,7.486520863
2014,February,1.482632291
2014,September,7.629378662
2015,February,1.467188204
2015,September,7.119723812
2016,February,1.077225024
2016,September,7.007754186
2017,February,0.884173944
2017,September,6.915089668
2018,February,0.89961803
2018,September,6.934394776
2019,February,1.023170721
2019,September,7.077252574
2020,February,1.127418304
2020,September,7.274164676
2021,February,1.11583524
2021,September,7.146750963
2022,February,0.853285771
2022,September,6.973004992
2023,February,0.737455124
2023,September,6.486516271
2024,February,0.82625862
2024,September,6.586902833