Source: Equal Measures 2030
No country was found to be making excellent progress - a score of 90 or above - with Denmark topping to pack with a mark of 89.3.
Speaking at the launch of the report, co-founder of the Bill & Melinda Gates Foundation - an organisation that aims to reduce global inequality - Melinda Gates said the data should be “a wake-up call to the world”, but added that some countries were making surprising progress.
"Many countries with the most limited resources are making huge strides in removing the barriers for girls and women ... demonstrating that when it comes to gender equality, governments shouldn't have excuses for inaction," she said.
The index measured progress in 129 countries, giving them a score between zero and 100 (meaning equality has been achieved) on 51 targets that affect the lives of women and girls.
The average global score was just 65.7, a mark within the poor category.
Meanwhile, only 21 countries scored above 80 (the good range), including the top 10 made up by Denmark, Finland, Sweden, Norway, Netherlands, Slovenia, Germany, Canada, Ireland and Australia (in that order).
On the other end of the spectrum, Sierra Leone, Liberia, Nigeria, Mali, Mauritania, Niger, Yemen, Congo, DR Congo and Chad represent the bottom 10 countries.
Of the top 20 countries in the index, 18 are in Europe and North America with only Australia and New Zealand falling outside the region.
Australia’s backyard, the Asia Pacific region, was the second lowest performer when it came to women in the top ranks of government.
Only three countries in the region - New Zealand, Indonesia and the Philippines - have passed the halfway mark in achieving gender parity in ministries or senior government positions.
Comparably, Sub-Saharan Africa was the lowest ranking region overall, but many countries performed well when it came to the proportion of women in government. Rwanda, for example, has achieved 61 per cent of women in the lower house of parliament.
But when it comes to the 2030 Sustainable Development Goals - developed in 2015 - no country has achieved the promise of gender equality, with nearly 40 per cent of women and girls living in countries failing gender equality (a score less than 59).