# comment
"time_start","time_end","fleet","obs"
1986,1987,1,9988
1987,1988,1,8264
1988,1989,1,9381
1989,1990,1,6896
1990,1991,1,8333
1991,1992,1,6627
1992,1993,1,5556
1993,1994,1,5540
1994,1995,1,5927
1995,1996,1,5789
1996,1997,1,6402
1997,1998,1,5934
1998,1999,1,5435
1999,2000,1,4943
2000,2001,1,5183
2001,2002,1,5700
2002,2003,1,5544
2003,2004,1,5200
2004,2005,1,4587
2005,2006,1,4454
2006,2007,1,4379
2007,2008,1,4367
2008,2009,1,3914
2009,2010,1,4100
2010,2011,1,4287
2011,2012,1,4664
2012,2013,1,4514
2013,2014,1,4833
2014,2015,1,5289
1995.5,1995.5,2,0.406
1996.5,1996.5,2,0.962
1997.5,1997.5,2,0.610
1998.5,1998.5,2,0.334
1999.5,1999.5,2,0.396
2000.5,2000.5,2,0.362
2001.5,2001.5,2,0.961
2002.5,2002.5,2,0.875
2003.5,2003.5,2,1.029
2004.5,2004.5,2,1.005
2005.5,2005.5,2,0.612
2006.5,2006.5,2,0.503893842
2007.5,2007.5,2,0.560195862
2008.5,2008.5,2,0.558181611
2009.5,2009.5,2,0.587901502
2010.5,2010.5,2,0.512424569
2011.5,2011.5,2,0.665288336
2012.5,2012.5,2,0.67984264
2013.5,2013.5,2,0.873247442
2014.5,2014.5,2,0.73265417