*Excludes Observations that spanned multiple years

Pre 19702
19700
19718
19720
19730
19740
19750
19760
19774
19784
19792
19802
19810
19820
19833
19847
198586
198673
1987120
1988405
198967
199064
1991146
1992208
1993271
199482
1995230
1996192
1997190
199869
1999167
2000140
2001116
200247
200372
2004112
200543
200695
2007106
2008117
2009114
201097
201165
2012105
2013124
2014111
201590
2016105
201793
2018108
201991
202051
2021130
202274
202333
202410
Total4651