The Home Office collect and publish statistics on the number of hate crimes recorded by the police on an annual basis. In 2015/16, the most recently published data, the police recorded 2,405 hate crimes in Wales. The statistical bulletin, which includes the number of hate crimes recorded by police force area (Appendix Table 2.01), can be found here: https://www.gov.uk/government/statistics/hate-crime-england-and-wales-2015-to-2016.
The Home Office does not hold data on the number of hate crimes prosecuted in the last 12 months. Data for the number of prosecutions for the year ending March 2016 is to be published by the Ministry of Justice in May 2017. The Home Office does hold some data on the outcomes of hate crimes recorded by the police, which can be found in the hate crime bulletin referenced above, but it is not broken down by police force area.