The Climate Policy Initiative  has been tracking climate finance since 2009, allowing for trends to be assessed; however, trends reported are a function of both real changes in finance and changes in methods and information sources . Total climate finance tracked by CPI has increased from USD 364 billion yr-1 in 2010/2011 to 579 billion in 2017/2018 . Tracked finance remained relatively constant from 2010/2011 to 2013/2014 but has increased steeply in more recent years. The proportion of finance allocated to adaptation has remained small throughout, between 4% and 8% ; a further 1-2% of global finance has been classified as 'multiple-objectives'. The large majority of tracked adaptation finance is from public sources , with only 2% coming from private sources in 2017/2018 . This is at least partly because of the difficulty in demonstrating financial  return on investment for adaptation.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report