No formal data collection system exists in the USA to collect and collate the number of sterilisations performed annually. The last time a survey was done was in 1991. It wasn't an actual count but an extrapolation of smaller surveys. To read how the survey was carried out Click here - it's a bit on the complicated side!
The National Center for
Health Statistics has some data up to 1996. The data is
based on surveys of married women and their birth control
methods. The statistics refer to "Being sterile" as opposed
to elective sterilisation. IE, they include women with
hysterectomy in the statistics. The vasectomy statistics
are not a count of men who have had a vasectomy, but men
married to the women in the survey where vasectomy was the
woman's primary method of birth control.
Summary
Full
table
In 2005, The Department For health & Human Services published a report entitled Contraceptive Use --- United States and Territories, Behavioral Risk Factor Surveillance System, 2002. It's data source is telephone questionnaires, and tabulates the results by birth control method used and State. I have a summary of the top 4 methods by state available.
The graph below shows the figures 1990 - 1999. The later figures published tend to be percentages of population. There are two figures quoted in each document - firstly the annual uptake, and secondly the percentage of the population between 19 and 69 who have had a vasectomy.
The trend since 2000 has been female sterilisation static at between 10% and 11%, and male sterilisation rising from 11% to 12% annual uptake. Between ages 40-49 men were more likely than women to have had an operation to become sterile (30% of men compared with 19% of women aged 40-44, and 32% of men compared with 21% of women aged 45-49). In all other age groups the proportions of men and women who had had an operation to become sterile were very similar.
Official UK statistics 2000Official UK statistics 2001
Official UK statistics 2002