2G, 3G, 4G and 5G users / sq km

i wonder what figures are for 2G, 3G, 4G in users/sq km since 5G claims to able to handle 1M users/km which is impressive

Ericsson are predicting that 1.5 billion users – 40 per cent of the global population coverage – will have access to a 5G network by 2024.

A 5G network supports ultra-high-speed data rates of up to 10 Gbps, low latency or delay and can cope with up to a million devices per square kilometer. With 5G, you can download a typical high-definition movie in under 40 seconds, as opposed to more than seven minutes with 4G.