*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000504045
1970004015
1971000011
1972000044
1973001034
1974001045
1975002046
19760130913
19770070512
1978002068
197912100821
198003601120
198101401015
19820160916
198300401418
198400401014
19851040914
1986011001324
1987011701836
1988101701533
1989082201141
19909491901491
19918182601062
1992113140937
199376828011114
1994315857016234
199559133015144
1996912054015198
1997655037016609
199843985108461
1999131944013377
2000151936016572
2001553049016600
2002240888012510
20031609106012728
2004570189016811
20056522168120717
200614524226113778
20070433171017621
200810234297111553
2009734135705710
20101637648007879
2011827252709816
201210480277022789
2013031427400588
2014116216300326
20152519902154
2016016450061
2017015100025
2018010001
Total14483103954351012921