For what it's worth (not much), the line can be extended with similar error bars to include:

- St Michael's Church in Bengaluru, India

- Gereja Katolik Santo Mikael in Surabaya, Indonesia

- St Michael's Catholic Church in Kilcoy, Australia

- St Michael's Church in Auckland, New Zealand

Perhaps the real data challenge here is to find the straight line with the most St Michael'ses globally.