*Excludes Observations that spanned multiple years

Pre 197035
19701
19710
19720
19731
19740
19750
19760
19771
19782
19790
19800
19810
19820
19831
19840
19859
198622
19870
19880
19890
199025
19910
19920
1993278
199481
19951
199615
19973
199826
1999194
2000154
200123
2002156
2003179
200411
200563
200610
200727
20087
200928
20101607
2011119
2012413
2013166
2014130
2015274
2016200
201718
20180
Total4280