Table 1.

Spearman’s correlation coefficients between HB incidence and GDP from 2004 to 2018 (by 3 year period).

Time Period	r	p
2004–2006	−0.336	0.312
2007–2009	−0.274	0.272
2010–2012	−0.286	0.148
2013–2015	−0.224	0.233
2016–2018	−0.360	0.047