Full listing of sponsors by year

[naderman]

I think the OpenCollective page is a bit suboptimal to look into who the current top sponsors are and who has contributed in the past. We think about sponsors on a calendar year level and thus I think it'd be great to have a complete list of sponsors with amounts contributed in a given calendar year. Instead of showing the current year which is incomplete, it probably makes sense to only show the previous calendar year and maybe "Last 12 months" as the current page.

I think it's a good idea to make this easily available publicly so anyone can see which companies contributed either to see if they follow up on their sponsorship promises or to see if one maybe wants to contact a company and ask if they don't want to become a sponsor too. Afterall anyone is welcome to help our efforts :-)