*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000405054
1970014038
19710050611
1972002068
1973005049
1974003036
19750080513
1976011801029
197701190929
197800601016
197900201315
1980002001131
198100901221
198210701523
1983001201224
1984001101728
1985011001324
198600701118
1987051801336
1988061011734
1989010311125
199019911333
199138112731
1992361101030
199316100825
1994491201540
1995821401236
19969121801655
19973102101549
19982113601463
1999273001655
2000162301646
2001542101242
200200310940
2003112911042
2004422901954
2005013001748
2006205201973
2007315622082
20082267723101
2009335801074
2010148401099
2011047811497
2012023302661
201301130519
2014035008
20151370213
2016002035
2017001001
Total60142974165921784