The World May Be Out Of Natural Blondes in 200 Years
Apparently, the last truly natural blonde might be born in Finland in roughly 2202.
Update: Thanks to Mrs H. for pointing out that this little fact mentioned in the article is a hoax (and I did put "blondes" into Snopes' search engine I just couldn't find it). That being said, the main point of the article was about how Caveman-era humans were the first natural blondes, and this little fact just was buried in it. The article is still worth a read.