*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
19720
19730
19740
19750
19761
19771
19782
19790
19801
19813
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19934
19940
19950
19962
1997518
199833
199989
2000494
2001188
2002326
2003267
2004111
200526
200638
2007108
20086
20093
201010
201164
201236
201335
201470
2015340
2016336
201731
201864
201910
202011
20216
20224
20235
20243
Total3248