*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19734
19740
19750
19760
19770
19781
19790
19800
19810
19820
19831
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19971
19981
19991
20000
20010
20020
20030
20040
20051
20061
20071
200891
200936
2010136
2011153
2012130
20135
2014126
2015296
2016241
2017529
2018157
2019375
2020120
2021143
2022123
2023152
202416
Total2841