Here are the (made-up) historical insurance bills for a high-rise office building in Chicago. What would be a good insurance inflation assumption based on this data, and why? Why did you choose the time period for reference that you did?

1995	$224,540
1996	$231,276
1997	$238,214
1998	$245,361
1999	$252,721
2000	$260,303
2001	$268,112
2002	$344,054
2003	$354,376
2004	$365,007
2005	$375,957
2006	$386,659
2007	$386,659
2008	$386,659
2009	$396,849
2010	$407,307
2011	$418,042
2012	$429,059
2013	$440,366
2014	$444,770
2015	$449,218
2016	$453,710
2017	$467,321
2018	$481,341
2019	$495,781
2020	$510,654