Why Google Hosted Libraries 1.8.3 already?

Why Google Hosted Libraries 1.8.3 already?

Google Hosted Libraries

jQuery
snippet:  <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
site:  http://jquery.com/
versions:  1.8.3, 1.8.2, 1.8.1, 1.8.0, 1.7.2, 1.7.1, 1.7.0, 1.6.4, 1.6.3, 1.6.2, 1.6.1, 1.6.0, 1.5.2, 1.5.1, 1.5.0, 1.4.4, 1.4.3, 1.4.2, 1.4.1, 1.4.0, 1.3.2, 1.3.1, 1.3.0, 1.2.6, 1.2.3
note: 1.2.5 and 1.2.4 are not hosted due to their short and unstable lives in the wild.