*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000108182
1970000033
197100001010
1972000077
1973000055
1974001056
1975000088
197600101516
197700201315
197800701421
197900601420
198000401418
198100101718
198200501621
198300101617
198400001717
198500021214
198600402125
198700822535
198800902332
198900421824
199000861832
1991005032275
1992004602167
1993002804674
1994003623371
1995004423278
1996004902877
1997003743576
1998003204375
1999002102849
2000003204577
2001004025193
2002004913484
2003003903372
2004001603551
2005004203678
20060061042103
20070043569117
200800861749152
20090085290177
20100052176129
2011001941105300
20120015429200383
2013009030133253
2014004004080
2015002705178
201600925768
2017001123851
201800941831
201900001919
Total00148411918813484