Top 10 Years in Metal History with Clusters of Great Albums and Songs from the Same Subgenre

I noticed some tendencies in metal music development - in some years the best metal albums / songs are from the same subgenre and these years probably mark the peak of this subgenre.

To every item on this list (year - subgenre) I listed bands, albums and songs. If you look at these albums and songs, grouped by year and subgenre, you will see that there is some logic in the metal music evolution.
The Top Ten
1 1986 - Thrash Metal
2 1994 - Black Metal

1) Mayhem - De Mysteriis Dom Sathanas (Freezing Moon, De Mysteriis Dom Sathanas, Funeral Fog)
2) Emperor - In the Nightside Eclipse (I Am the Black Wizards, Cosmic Keys to My Creations and Times, Into the Infinity of Thoughts)
3) Darkthrone - Transilvanian Hunger (Transilvanian Hunger)
4) Gorgoroth - Pentagram (Maaneskyggens Slave, Ritual)

3 1983 - Traditional Metal

1) Iron Maiden - Piece of Mind (The Trooper, Flight of Icarus, Where Eagles Dare)
2) Dio - Holy Diver (Holy Diver, Rainbow in the Dark, Don't Talk to Strangers)
3) Mercyful Fate - Melissa (Satan's Fall, Evil, Curse of the Pharaohs, Melissa)
4) Accept - Balls to the Wall (Balls to the Wall)

4 1996 - Death Metal
5 1970 - Metal

Black Sabbath and Deep Purple released the first albums with some proto-metal songs on them.
These 2 albums aren't pure metal but they have some (proto) metal songs.
Both bands were founded in 1968 in the UK, both bands released metal songs in 1970 - this sounds like metal music was meant to be. In 1970.
Two more bands released albums with 1 metal song: Uriah Heep (formed in 1969) and Lucifer's Friend (formed in 1970).

1) Deep Purple - In Rock (Hard Lovin' Man, Speed King, Child In Time, Flight of the Rat, Bloodsucker).
2) Black Sabbath - Black Sabbath (Black Sabbath, the first doom metal song)
3) Uriah Heep -...Very 'Eavy...Very 'Umble (song: Bird of Prey, on the US version in 1970, on the UK version in 1971)
4) Lucifer's Friend - Lucifer's Friend (song: Ride the Sky)

6 1989 - Technical Thrash Metal
7 1998 - Power / Symphonic Metal

1) Blind Guardian - Nightfall in Middle-Earth (Mirror Mirror, Nightfall, Thorn, Into the Storm)
2) Edguy - Vain Glory Opera (Out of Control, Vain Glory Opera, No More Foolin)
3) Nightwish - Oceanborn (The Pharaoh Sails to Orion, Devil and the Deep Dark Ocean)

8 2015 - Progressive Metal
9 1999 - Progressive Metal

1) Dream Theater - Metropolis Part 2: Scenes from a Memory (Home, The Dance of Eternity, Finally Free)
2) Opeth - Still Life (The Moor, Moonlapse Vertigo, Godhead's Lament)
3) Nevermore - Dreaming Neon Black (Dreaming Neon Black, No More Will)

10 1993 - Melodic Death Metal
The Contenders
11 1998 - Technical Death Metal
12 1984 - Traditional Heavy Metal

1) Iron Maiden - Powerslave
2) Judas Priest - Defenders of the Faith

Those are 2 popular ones

13 2002 - Progressive Metal
14 2004 - Death Metal
15 1991 - Death Metal
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