A nice website, worth checking. I just clipped two snippets from the history page. The first highlights Mull of Kintyre, the Wings single that outsold any Beatles single. That was a surprise. The other “factoid” is just odd: “German 1982 Eurovision winner ‘A Little Peace’ by Nicole becomes the 500th Number One in the history of the charts”. Now you know and you don’t have to thank me.
But the site gets even better: you can dig more info by yourself: all singles and album charts since 1960 are available.
The Featured Artists pages are also nice. This is the Human League interactive chart history: