Question 41:Calculations gone wrong?

Towards the end of the year-

Sitter for this morning (Identify missing element. It is extremely easy and more so since all elements are arranged alphabetically and very conveniently)

Ab urbe condita-2763

Armenian-1459

Baha'i-166-167

Bengali-1417

Berber-2960

Buddhist-2554

Burmese-1372

Byzantine-7518-7519

Chinese-4646/4706-11-17 to 4647/4707-11-26

Coptic-1726-1727

Ethiopian-2002-2003

X-Y

Hebrew-5770-5771

Hindu-

1.Bikram Samwat-2066-2067

2.Shaka Samwat-1932-1933

3.Kali Yuga-5111-5112

Holocene-12010

Iranian-1388-1389

Islamic-1431-1432

Japanese-Heisei 22

Korean-4343

Thai-2553