S&P ASX 200 Index - New calendar year closing high in December suggests additional gains

I note that December has delivered its usual upward bias with the S&P ASX 200 Index (XJO) gaining 1.71% for the month with 6 trading days till month end. I also note that yesterday marked a new calendar year closing high for the S&P ASX 200 Index. Interestingly, following a new calendar year closing high in December, the market had a tendency to continue the upward move to year end, producing an average additional gain of 1.38% with a win rate of 8 from 9.