Table 1 Completeness of panel data

Year	Any data	All data	Balanced ≥2007	Any <2008	Any >2013	Any (2P)
2005	27	21		118		109
2006	85	77		118		109
2007	99	92	64	118		109
2008	104	100	64
2009	109	105	64
2010	118	110	64
2011	138	130	64
2012	134	122	64
2013	130	119	64
2014	137	122	64		129	109
2015	136	120	64		129	109
2016	133	116	64		129	109

The first column lists the number of countries with coverage within our core set of variables for each year of the Gallup World Poll, after some imputation done in accordance with the data appendix of Helliwell et al.⁸. The All data column lists the number of countries with all of our core variables. The Balanced column shows the number of countries in the largest balanced (complete, rectangular) panel covering all years after 2006. For our two-period model, we use the countries with at least one observation in the early period and at least one observation in the later period

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