*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19753
19761
19771
19781
19791
19803
19810
19820
19830
19840
19850
19860
19870
19880
19890
19909
19916
199212
19932
19946
199515
19966
19970
19982
19998
200010
200113
20025
200324
200429
200516
20066
200711
200820
20090
201025
201115
201241
201310
20145
20150
20160
20170
201813
20190
20200
2021201
20220
20230
20240
Total520