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.
November 2018
The Business Demography data set gives the survival rates of those businesses previously ‘started’ and includes 5 year survival rates of those businesses started in 2012.  The latest Business Demography data set was released in November 2018 and relates to the picture in 2017. 
The 5 year survival rate for those businesses started in 2012 has increased slightly from those 5 year rates in the previous year.  West Sussex 5-year survival rates at 47% is higher than for England (43.1%) and the South East region (44.8%).  Horsham has the highest 5-year survival rate at 49.3%, which is the third highest amongst local authorities in the South East region,   and Crawley has the lowest survival rate at 42.5%. 
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.