Unfortunately the script I’m using to acquire the statistics isn’t fast, people responsible for the zmap network scanner have performed a quick look at both Alexa Top 1 Million domains as well as the IPv4 address space.
In short, they found 1186 sites (0.02% of Alexa top 1M) to support SSLv3 as the highest TLS version. At the same time, 96.9% support SSLv3. If we take a look on all of IPv4 address space, the percentage rises to 0.8% and 98.1% respectively.
Head over to their article for details.