*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19733
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19842
19853
19862
19872
19884
198916
19905
199127
199218
199315
199426
199534
19968
199710
19981
19996
20003
20016
20023
20031
20040
200520
20063
20073
20082
20090
201014
201110
201256
201330
20140
20154
201615
201712
20183
20190
20200
20210
20220
Total367