*Excludes Observations that spanned multiple years

Pre 197017
19700
19710
19720
19730
19740
19753
19762
19771
19783
19798
19802
19812
19824
19833
19842
19858
19869
19876
198810
19899
199013
199112
19926
19937
199416
199529
199637
1997105
1998106
1999161
200059
200158
200249
200377
200442
200567
200692
200782
200852
200994
2010125
2011127
2012114
201382
201482
201581
201617
20170
20180
20190
20200
20210
20220
Total1881