Fights between previous year-end top 10 heavyweights.

I am doing an exercise to see how many fights occurred in the following twelve months between Ring's top 10 year-end heavyweights, bear with me as this is a slow process. Feel free to grab a decade and do the work for me!! I did a tester for year end 1970 and was amazed to find only one fight in 1971 between the top 10 but I need much more information to draw any conclusion.
2011-3
2012-1
2013-1
2014-2
2015-4
2016-0
2017-2
2018-5
2019-2
2020-2
2021-2.
The year quoted is the year of the fights, if you follow me. I wouldn't get too hung up on whether you agree with the precise top ten, it should balance out. There will be anomalies, eg Chisora was not in any top ten, he could be in a lot and this would add a lot of contests. I have taken the Ring champion and top 9 contenders; top ten contenders if the title was vacant. This exercise may prove or disprove several myths or claims.

 

Yes, basically how many fights took place in the following year of the year-end top 10, eg how many of the 1989 year-end top ten, fought another of that top ten in the calendar year 1990.

 

Update;
2001-3
2002-5
2003-3
2004-2
2005-2
2006-5
2007-3
2008-4
2009-2
2010-1

 

I could but I won't...ha ha!! great idea though.

 

EASILY THE BEST DECADE YET;
1991 5
1992 2
1993 3
1994. 3
1995. 4
1996. 4
1997. 4
1998. 1
1999. 4
2000. 4

 

Charles had 6 alone in 51!

 

Yeah, great to have help. It dispels myths to have actual facts, no agenda. Thanks for your input, hopefully more join in to help, takes me over an hour to do a decade.