FACET_SORT_INDEX descending?

[Gerald Snyder]

Is there any value for the "f.my_year_facet.facet.sort"  parameter that 
will return the facet values in descending order?   So far I only see 
"index" and "count" as the choices. 

http://lucene.apache.org/solr/api/org/apache/solr/common/params/FacetParams.html#FACET_SORT_INDEX
Thanks.
Gerald Snyder 
Florida Center for Library Automation