New and updated. So since 2005 is has increased less than 50% of the time. Doesn’t sound like usual to me. But yes, one can play around time period and change that %.
http://www.energy.gov.za/files/esources/petroleum/petroleum_arch.html
2017 November to December change for Unleaded Inland 95
R14.05 rose to R14.76
2016 November to December change for Unleaded Inland 95
R12,57 dropped to R12,37
2015 November to December change for Unleaded Inland 95
R12,39 rose to R12.40
2014 November to December change for Unleaded Inland 95
R13,16 dropped to R12,47
2013 November to December change for Unleaded Inland 95
R13,02 rose to R13,19
2012 November to December change for Unleaded Inland 95
R12,10 dropped to R12,01
2011 November to December change for Unleaded Inland 95
R10,77 dropped to R10,66
2010 November to December change for Unleaded Inland 95
R8.32 rose to R8.45
2009 November to December change for Unleaded Inland 95
R7.65 rose to R7.92
2008 November to December change for Unleaded Inland 95
R8.96 dropped to R7,35
2007 November to December change for Unleaded Inland 95
R7.04 rose to R7.47
2006 November to December change for Unleaded Inland 95
R5.97 dropped to R5,90
2005 November to December change for Unleaded Inland 95
R5.75 dropped to R5,45