The data above is taken from the Business Demography dataset from ONS which gives, numbers of ‘births’, ‘deaths’and survivals of businesses in the UK, figures are available down to local authority level.
December 2019
The Business Demography data set gives the survival rates of those businesses previously 'started' and includes 5 year survival rates of those businesses that started in 2013. The latest Business Demography data set was released in November 2019. The five year survival rates of business started up in 2013 in West Sussex is slightly lower than the 5 year survival rates for those businesses started up in 2012. However West Sussex 5 year survival rates at 46.1 is higher than for England (42.5) and for the South East region (44.6). West Sussex compared with its statistical neighbours has a low survival rate - and lies in the second to lowest quartile. Adur and Arun have the highest 5 year survival rates in West Sussex, indeed they have the highest 5 year survival rates compared with all other local authorites (including unitaries) in the South East region, Crawley has the lowest survival rate, despite having the highest start-up rate, and Crawley has one of the lowest survival rates compared to other authorities in the South East.
January 2018
The business survival rate is the percentage of businesses started in 2011 which are still in operation in 2016 – so a 5 year survival rate. 
The 5 year survival rates of businesses started in 2011 are marginally higher in West Sussex than the regional average, and above the national average. 
West Sussex compares well with the other 19 upper tier and unitary authorities in the South East region with the county now just lying within top quartile, the lowest survival rate in the South East is seen in Southampton at 38.7% and the highest survival rate being found in Wokingham at 52.0%.
Compared with Nearest Statistical Neighbours West Sussex doesn’t compare so favorably though has risen and just made it to Quartile 3. The ambition is for West Sussex to be in the top quartile by 2022.